Obscurement

This spell causes a misty vapor to arise around the druid. 

It persists in this locale for 4 rounds per level of experience of the druid casting the spell, and it reduces visibility of any sort (including infravision) to 2-ft to 8-ft (2d4). 

The area of effect is a cubic progression based on the druid's level of experience, a 1" cube at 1st level, a 2" cube at 2nd level, a 3" cube at 3rd level, and so on. Underground, the height of the vapor is restricted to 1", although the length and breadth of the cloud is not so limited. 

A strong wind will cut the duration of an obscurement spell by 75%.

A gust of wind spell will cause the vapor to swirl and dissipate in 25% of the normal time, so that instead of the obscurement lasting for 4 rounds per level it will last for but 1 round per level, once the gust of wind has been cast, of course.